Finding the Fourth Proportional to 378.10, 565.80 and 345.70
Calculator
Solution
The fourth proportional to 378.10, 565.80 and 345.70 is: 517.32
Step by Step Solution
- Step 1: Write the proportion equation
378.10 : 565.80 = 345.70 : x - Step 2: Convert to fraction form
378.10/565.80 = 345.70/x - Step 3: Cross multiply
378.10x = 565.80 × 345.70 - Step 4: Simplify right side
378.10x = 195,597.06 - Step 5: Solve for x
x = 195,597.06/378.10 - Step 6: Final answer
x = 517.32
Related Problems
Find fourth proportional to 189.05, 282.90 and 172.85
Half scale
Find fourth proportional to 756.20, 1,131.60 and 691.40
Double scale
Find fourth proportional to 379.10, 567.30 and 346.70
Similar ratio
Find fourth proportional to 567.15, 848.70 and 518.55
1.5x scale
Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.